Presser-foot mechanism.



PATENTED NOV. 20, 1906'.

0. ymmsm. PRESSER FOOT MECHANISM.

APPLICATION FILED AUG.14.1905.

3 SHEETS'-SHEET 1.-

Inventor.

Witnesses 6 W P n/M m FM h m ATT'Y's.

THE NORRIS PETER cm, WASRINGTUN, n, c.

C. PBDERSEN.

PRESSBR FOOT MECHANISM.

APPLICATION FILED AUG.14, 1905.

PATENTED NOV. 20,- 1906.

3 SHEETS-SHEET 2.

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PATBNTED NOV 20, 1906.

0. PEDERSBN.

PRESSER FOOT MECHANISM.

APPLICATION FILED AUG.14, 1905.

3 SHEETS-SHEET 3 inventor- Chrisbian Peelers en BY A'TTYs.

, wasnmarou, 04 c UNITED STATES I PATENT OFFICE.

CHRISTIAN PEDERSEN, OF ST. LOUIS, MISSOURI, ASSIGNOR TO LANDIS MACHINE COMPANY, OF ST. LOUIS, MISSOURI, A CORPORATION OF MISSOURI.

PRESSER-FOOT MECHANISM.

Patented Nov. 20, 1906.

Application filed August 14, 1905. Serial No. 274,117.

To all whom, it may concern.-

Be it known that I, CHRISTIAN PEDERSEN, a citizen of the United States, residing at St. Louis, Missouri, have invented a certain new and useful Improvement in Presser-Foot Mechanisms, of which the following is a full, clear, and exact description, such as will enable others skilled in the art to which it appertains to make and use the same, reference being had to the accompanying drawings, forming part of this specification, in which Figure 1 is a side elevation of a ortion of a sewing-machine with a presseroot operating mechanism constructed in accordance with my invention. Fig. 2 is a detail view, in side elevation, showing the awl-operating mechanism and the presser-foot in engagement with a piece of work. Fig. 3 is an edge view of the cam-disk for operating the awl. Fig. 4 is a top plan view of the awl-operating mechanism with which my invention cooperates. Fig. 5 is a detail perspective view of the clutch on the resser-foot actuating bar; and Fig. 6 is a detail perspective view showing the presser-foot actuating-bar, the release-lever, and its appurtenances.

This invention relates to a presser-foot mechanism for sewing-machines and one object of the invention is to provide a presserfoot which will exert a yielding pressure on the work while it is being fed and which will exert a ositive pressure on the work while the stitch is being formed.

Another object of the invention is to provide means for varying the degree ofpositive pressure which the presser-foot exerts on the work, so that the work will not be marred or defaced and still another object 1s to provide means under control of the operator for causing the positive-pressure actuating means to become inoperative and also cause the presser-foot to be raised from engagement with the work.

Other objects and advantages, as well as the. novel details of construction of this invention, will be specifically described hereinafter, it being understood that changes in form, proportion, and mlnor details of construction may be resorted to wlthout departing from the s irit of my invention or sacrificing any of t e advantages thereof.

Referring now to the drawings by numerals of reference, 1 designates the frame having a work-table 2 thereon. The work 3 is held on the work-table by a presser-foot 4.

5 indicates the awl which penetrates the work prior to the insertion of the needle.

This awl is carried by a rock-shaft 6, mount-' shaft 14, mounted in the machine-frame, so

that therotation of the shaft 13 in the direction indicated by the arrow will impart a rocking movement to the lever 9 and cause the shaft 6 to rock, so that the awl 5 will penevtrate the work. A mechanism is provided for impartin a sidewise movement to the awl, so as to eed the work, and this mechanism consists of a sidewise-movable pivoted lever 15, having a depending roller 16, which operates in a cam-groove 17 in the periphery of the disk 12. The lever 15 is provided with a constricted end 18, which cooperates with a shifter 19, fastened to the shaft 6 and carrying the awl 5. At each operation of the machine the shifter and shaft 6 are moved sidewise, so as to feed the work the distanceequal to the length of a stitch, which movement may be regulated by appropriate mechanism fully described in an application filed by me of even date herewith and given Serial No. 274,115.

The presser-foot 4 is provided at its rear end with a slot 20, engaged by a pin 21 on one end of a vertically-movable actuatingbar 22, which is held normally in an elevated position to cause the presser-foot to engage the work by means of a spring 50, fastened to the frame of the machine and engaging a pin in the upper end of the bar 22. This bar 22 passes through a bearing in the bracket-arm 23 on the frame of the machine, which bracketarm is provided with a screw 24, forming a stop that regulates the degree of pressure which the presser-foot exerts on the work, as hereinafter described.

On the shaft 13 is a cam 25, provided with a peripheral recess 26, as shown in dotted lines in Figs. 1 and 2.

27 is an elbow-lever fulcrumed at 28 and having terminal rollers 29 and 30.

31 is a coiled spring surrounding the bar 22, and one end of the spring 31 bears against a bearing 32 on the frame of the machine and the other end bears against a clutch-collar 33, loose on the bar 22.

Pivoted at 34 in the collar 33, as shown in Fig. 5, is a lever 35, which is provided with an annular end 36, adapted to bite or impinge against the bar 22 and hold said bar locked in an elevated position for causing the presser-foot to positively clamp the work, said lever 35 being actuated for this purpose by means of the elbow-lever 27 whenever its roller 30 is traveling on the concentric portion of the cam 25. An elbow-lever 37 is pivoted at 38 to the frame of the machine,

and has a horizontal arm 39,'adapted to bear against the collar 33 under certainconditions, the vertical portion of the elbow-lever 37 having a cam portion 40, adapted tov be engaged by the shoulder 41 on the shift-lever 42, fulcrumed at 43 and provided with an arm 51, adapted to cooperate with the pin 21 in the lower end of the bar 22 to depress said bar, and thus elevate the presser-foot to permit the work to be freely manipulated.

The presser-foot is adapted to hold work of different thicknesses, and when the work is inserted between the presser-foot and the table the work will be clamped in place until.

the awl 5 has made an opening therein and the needle has passed through said opening with the thread. The mechanism will be so timed that while the awl is making the openingand the needle is passing through with the thread the roller 30 on the elbow-lever 27 will be traveling on the concentric portion of the cam 25, which cam is rotated in the direction indicated by the arrow in Fig. 2, and at such times the arm 35 will be actuated to cause its end to. impinge against the bar 22, and the bar will be held in an elevated position, so as to raise the rear end of the presser-foot 4 and cause the forward end of said presser-foot to positively clamp the work. When the cam 25 has made, say, four-fifths of a revolution, the roller 30 will pass into the peripheral recess 26 in said cam, so as to release the arm 35 from engagement with the bar 22, and the spring 31 will then force the collar 33 downwardly against the elbow-lever 37, the bar 22 at such times being freely movable, so that the spring 50 causes the resser-foot to engage the work with only a yielding pressure. When the roller passes out of said recess and the lever'27 is again actuated by the cam 25, the end of the arm 35 will engage the bar 22 and raise it. This raising of the bar will be sufficient to cause the presser-foot to clamp the work positively during the stitch-forming, but the Work will be released from positive pressure immediately after the stitch is formed and will be clamped yieldingly while it is being fed.

For preventing the presser-foot from engaging the work with too great a pressure, so that it would mar the work, I have provided the stop 24, which can be adjusted to vary the normal position of the elbow-lever 37 and accordingly vary the position of the collar 33 and lever 35 relatively to the lever 27, which actuates them.

If the operator desires to release the work by taking off the positive pressure of the presser-foot and raising it from engagement with the work at any stage in the operation of the machine, he will move the handle of the actuating-lever 42 toward the front of the machine or to the right of Fig. 1, so that the shoulder 41 will pass over the cam portion 40 of the elbow-lever 37, thereby causing the horizontal portion 39 of the elbow-lever 37 to move upwardly and raise the sleeve, thus destroying the biting engagement of the. portion 36 of the lever 35 with the bar 22, and through means of the arm 51' depressing the bar 22 to elevate the presser-foot and permit the work to be freely manipulated.

From the foregoing it will be apparent that the device is adapted for clamping work of different thicknesses, and by manipulating the screw 24 the downward-sliding movement of the clutch-collar may be controlled for varying the degree of pressure with which the presser-foot positively clamps the work.

Having thus described the invention,what is claimed as new, and desired to be secured by Letters Patent, is

1. In a sewing-machine, a work-feeding mechanism a pivotally-mounted presser-foot, a bar for actuating said presser-foot, yielding means for actuating said bar to cause the presser-foot to engage the work yieldingly during the feeding operation, and independent means for actuating said bar and holding it at rest for causing the presser-foot to engage the work with a positive pressure while a stitch is being formed therein; substantially as described.

2. In a sewing-machine, a work-feeding mechanism a presser-foot, a presser-foot bar for'actuating said presser-foot, a collar loosely mounted on said bar, a device carried by said collar and adapted to engage said bar, and

means adapted to engage said device and move it to cause it to engage said presser-foot bar, move it upwardly, and hold it at rest for causing the resser-foot to clamp the work with a positive pressure while the workfeed ing mechanism is inoperative; substantially as described.

3. In a sewing-machine, a pivotallymounted presser-foot, a bar for actuating said presser-foot, a collar loosely mounted on said bar, adjustable means for governing the normal position of said collar, a device carried by said collar and adapted to engage said bar, and means independent of. the collar for engaging said device to cause the presser-foot bar to be moved upwardly and IOC le s

held at rest to cause the resser-foot to clamp the work positively; substantially as described.

4. In a sewing-machine, a work-feeding mechanism a presser-foot, a bar pivotally connected to said presserfoot,yielding means for actuating said bar to cause the presserfoot to engage the Work with a yielding pressure while the feeding mechanism is feeding the work, positive means for moving said bar upwardly and holding it at rest to cause the presser-foot to engage the Work with a positive pressure while a stitch is being formed therein, and means under control of the operator for releasing said bar from engagement with said positive means and elevating the presser-foot from engagement with the work; substantially as described.

5. In a sewingunachine, a presser-foot, a bar for actuating said presser-foot, a collar loosely mounted on said bar and provided with a pivotally-mounted device for engaging said bar, means for governing the normal position of said collar, a spring for forcing said collar toward said means, an elbowlever for actuating the pivoted device on said collar for causing it to engage said bar,

7 moving it and then holding it at rest for causing the resser-foot to engage the work with a positive pressure, and a cam for actuating said elbow-lever; substantially as described.

6. In a sewing-machine, a pivotallymounted presser-foot, a reciprocating bar for actuating said presser-foot, yielding means for actuating said bar to cause the presserfoot to engage the work with a yielding pres sure during the feeding operation, a collar loosely mounted on said bar and provided with a pivotally-mounted device adapted to engage said bar, an actuated lever cooperating with said device for causing it toengage said bar, move it upwardly, and hold it at rest for causing the presser-foot to enga e the work with a positive pressure, and a andoperated lever adapted to be actuated for disengaging said device from said bar and for moving the presser-foot from engagement with the work; substantially as described.

In testimony whereof I hereunto affix my signature, in the presence of two witnesses, this 11th day of August, 1905.

CHRISTIAN PEDERSEN. Witnesses:

B. F. FUNK, GEORGE BAKEWELL. 

